Universal Extractor is a program do to exactly what it says: extract files from any type of archive, whether it's a simple zip file, an installation program, or even a Windows Installer (.msi) package. Universal Extractor is written in AutoIt, a powerful open source scripting language. Universal Extractor itself, however, is just a front-end that uses many other programs to do the dirty work. The full list of supported formats can be found here.